The Buffalo Bills aren’t commenting on the reason behind James Cook not participating in practice on Sunday in what could be viewed as the running back’s next step in escalating his bid to extend the final year of his contract.

Buffalo Bills running back James Cook was the one Buffalo star in line for an extension that didn't receive one this spring. Greg Rousseau, Khalil Shakir, Terrel Bernard, Khalil Shakir, and Josh Allen all received new deals over the offseason, but the Pro Bowl running back was left without one.

Buffalo Bills running back James Cook had a simple explanation for holding out of a recent training camp practice.